I just threw some cigarette butts on the ground while I was driving.
I wasn't clean after this.
Listen up, dum-dum. This joke is all about a play on words. When the person says they "weren't clean," they ain't talkin' 'bout hygiene. They mean they didn't stop littering! See, you thought they meant they were still dirty from throwin' butts out the window. You probably still throw trash out the window, don't you?
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Good on you buddy